random sampling指的是下面哪一项：（)A、比较报告B、抽样调查C、问卷调查D、随机抽样

随机抽(取)样(random sampling)

cluster sampling指的是下面哪一项：()

A、概率抽样

B、整群抽样

C、系统抽样

D、配额抽样

“PPS sampling”指的是整群比例抽样。()

A.Binary

B.Random

C.Input

D.Append

A.technical sampling + initial sampling

B.technical sampling + other samples

C.olor sampling + initial sampling

D.Software sampling + initial sampling

分层抽样 (stratified sampling)

Paragraph 6_________．

A．Significance of testing techniques for sampling microbes in the deep ice sheet

B．special features of lake Vida

C．1ater expedition on mars

D．2004 revisit planned for collecting lake water specimen

E．Antarctic frozen life sampled and revived

F．Accidental discovery of ice-sealed lake water Antarctica

ping, TV-and-phone marketing and phone-banking in recent years is proof that see-and-feel is not the only way to sell.

A. While

B. If that

C. When

D. Which

A.日本

B.印尼

C.意大利

D.美国